Minor code cleanup.

Replace occurrence of 4 with sizeof(float) where appropriate

Author: jyavenard

mythtv/libs/libmyth/audio/audiooutputbase.cpp

@@ -742,7 +742,8 @@ void AudioOutputBase::Reconfigure(const AudioSettings &orig_settings)
             output_format = output_settings->BestSupportedFormat();
     }
 
-    bytes_per_frame =  processing ? 4 : output_settings->SampleSize(format);
+    bytes_per_frame =  processing ?
+        sizeof(float) : output_settings->SampleSize(format);
     bytes_per_frame *= channels;
 
     if (enc)
@@ -1213,7 +1214,7 @@ int AudioOutputBase::CopyWithUpmix(char *buffer, int frames, uint &org_waud)
 
     // Upmix to 6ch via FreeSurround
     // Calculate frame size of input
-    off =  processing ? 4 : output_settings->SampleSize(format);
+    off =  processing ? sizeof(float) : output_settings->SampleSize(format);
     off *= source_channels;
 
     int i = 0;
@@ -1689,8 +1690,8 @@ int AudioOutputBase::GetAudioData(uchar *buffer, int size, bool full_buffer,
     bool fromFloats = processing && !enc && output_format != FORMAT_FLT;
 
     // Scale if necessary
-    if (fromFloats && obytes != 4)
-        frag_size *= 4 / obytes;
+    if (fromFloats && obytes != sizeof(float))
+        frag_size *= sizeof(float) / obytes;
 
     int off = 0;